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T: Fachverband Teilchenphysik

T 68: Standard Model Physics III

T 68.3: Vortrag

Donnerstag, 19. März 2026, 16:45–17:00, KH 00.014

Analysis of multi-τ final states of diboson processes with the ATLAS detector — Philip Bechtle, Yann Buchholzer, Klaus Desch, Christian Grefe, and •Simon Thiele — Rheinische Friedrich-Wilhelms Universität Bonn

The process ZZ→4τ is a theoretically well understood standard model process but has never been observed. In addition to the small cross section and branching ratio there are several challenges posed by this channel. Among them are the fake estimation of combinations of up to four hadronic tau-candidates, the mass reconstruction in final states with at least four neutrinos, the pair-wise combination of the τ’s, and the selection of triggers to use.

Additionally to being itself an interesting discovery, the work on multi-τ final states can serve as a template for future HH→4τ searches, which could add to the discovery potential for triple Higgs couplings at the LHC. Furthermore there is the potential to discover other heavy scalars in the 4τ final state if there is resonant A→ HH production as opposed to merely the off-shell standard model production.

In this talk I will present an overview of previous efforts and the initial work already done in this analysis, going over theoretical expectations and the analysis strategy.

Keywords: Diboson; Multi-Tau; Tau; ZZ